Re: Adding a bench to old Glasspar
I also own a Glasspar Citation. I went against conventional wisdom (wood, and all the others) and cut my splash well out in order to repair the transom, deck and stringers. I plan on re installing it after all my deck work is complete. In hindsight, I would have listened to the ol' salty dogs on this site and NOT cut my splash well out, and opted to just lift the entire top cap off.
If you decide to cut the splash well out, you may need to re enforce your transom. When I pulled my transom, the motor was only supported by two layers of 3/4" plywood about five inches left and right of the mounts. The rest of the transom was one layer of 3/4" ply with NO inboard layer of lamented wood!
The splash well gives the builder (in this case Larson / Glasspar) the ability to use less plywood and TRY to spread the load of the motor, and the stressing of the hull over the splash well. In my case my boat's transom rotted as there was never anything laminated higher than the edge of the transom where the motor mounts to. (see picture below) Picture is taken looking to the stern along the port edge, under the splash well.
So what you will find is that you will have to basically add another layer of 3/4" thickness on the sides of your transom to even it out, then you will be left with the top cap edge that will have to be continued out.
I've included a few pictures of the demo process of my boat.